NXP Semiconductors PCA9621PW,118

Overview

PCA9621PW,118 from NXP Semiconductors is an 8-bit I²C-bus controlled open-drain output port IC with 65 mA per-port sink capability, programmable via a single 8-bit control register, and operating from 2.7 V to 5.5 V supply. It supports Fast-mode Plus (Fm+) I²C up to 1 MHz and 4000 pF bus capacitance, making it suitable for driving LEDs in large-scale display systems and industrial indicator panels.

For engineers reviewing the PCA9621PW,118 datasheet, PCA9621PW,118 pinout, PCA9621PW,118 application, or PCA9621PW,118 equivalent, key selection criteria include its 65 mA per-output sink rating, TSSOP16 package compatibility with high-density PCB layouts, Fm+ bus drive strength, reset-controlled safe-state initialization, and address-pin configurability for multi-device bus expansion.

Technical Context

The PCA9621PW,118 implements an I²C slave transceiver with Fast-mode Plus compliance (30 mA drive, 4000 pF load), enabling reliable communication across long cables or high-capacitance bus topologies. Its internal control register directly maps each bit to one of eight open-drain outputs (P0–P7), with logic HIGH in the register enabling sink operation (LOW output voltage).

Power-On Reset (POR) asserts a 500 ns internal reset, initializing all outputs to high-impedance (register = 0x00). The active-low RESET pin provides external synchronous reset, clearing the control register and disabling all outputs. Address pins A0–A2 allow up to eight unique slave addresses on a shared bus (1100 A2 A1 A0 R/W).

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, 4.4 mm body width, 0.65 mm lead pitch, designed for high-density surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit I²C output port applications.

Compared with TCA6408A and PCA9671, the PCA9621PW,118 uniquely balances 65 mA per-port drive, Fm+ bus robustness, hardware address flexibility, and open-drain simplicity-making it optimal for scalable LED display and industrial indicator systems requiring both performance and layout efficiency.

Availability

PCA9621PW,118 is available at Aetrix Electronics and suitable for LED display systems, industrial HMI indicator panels, and large-scale lighting control applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for PCA9621PW,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCA9621PW,118 belongs to NXP's I²C-bus peripheral portfolio, designed specifically to simplify LED and general-purpose output control in resource-constrained embedded systems while maintaining interoperability with industry-standard bus protocols.

FAQ

What is the maximum continuous sink current per output port on the PCA9621PW,118?

The PCA9621PW,118 supports 65 mA continuous sink current per output port (P0–P7) under specified conditions (Tamb = −40 °C to +85 °C, VDD = 5.5 V). This rating is confirmed in Table 4 of the official NXP datasheet. Exceeding this value risks thermal overstress or parametric shift. For higher aggregate loads, ports may be paralleled - up to 500 mA total - provided current sharing is balanced and thermal limits are observed.

Does the PCA9621PW,118 support Fast-mode Plus (Fm+) I²C operation?

Yes, the PCA9621PW,118 fully supports Fast-mode Plus I²C operation with 30 mA drive capability on SCL/SDA, enabling reliable communication at clock frequencies exceeding 1 MHz and with bus capacitances up to 4000 pF. This is explicitly stated in Section 1 (General description) and verified in Table 4 (Characteristics) of the NXP datasheet. The Fm+ compliance allows robust interfacing in electrically noisy or extended-cable environments.

How does the RESET pin function on the PCA9621PW,118?

The RESET pin on the PCA9621PW,118 is an active-low asynchronous input that clears the internal 8-bit control register to 0x00, forcing all eight output ports (P0–P7) into high-impedance (OFF) state. It also resets the I²C-bus slave transceiver block. As specified in Section 7.4, the pin has hysteresis (200 mV typical at VDD = 5.5 V) and responds within 25 ns after crossing VIL threshold. This ensures deterministic fail-safe behavior during power sequencing or fault recovery.

Can multiple PCA9621PW,118 devices share the same I²C bus?

Yes, up to eight PCA9621PW,118 devices can operate on a single I²C bus using hardware address pins A0, A1, and A2. These pins configure the three LSBs of the 7-bit slave address (base 0xC0), yielding addresses 0xC0 through 0xC7. As shown in Figure 4 of the datasheet, no external pull-ups or jumpers are needed - each device's address is set by connecting A0–A2 to VDD or VSS. This enables scalable LED matrix or multi-display systems without bus arbitration complexity.

What package type is used for the PCA9621PW,118?

The PCA9621PW,118 uses the TSSOP16 package (SOT403-1): a plastic thin shrink small outline package with 16 leads, 4.4 mm body width, and 0.65 mm lead pitch. This is confirmed in Table 1 (Ordering information) and Figure 3 (Pin configuration for TSSOP16) of the NXP datasheet. The package is RoHS-compliant, reflow-solderable, and optimized for high-density PCB layouts where SO16 would occupy excessive area.